A solution is sought to the general problem of simplifying switching circuits that have more than one output. The mathematical treatment of the problem applies only to circuits that may be represented by “polynomials” in Boolean algebra. It is shown that certain parts of the multiple output problem for such circuits may be reduced to a single output problem whose inputs are equal in ...
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In December 1951, at the joint AIEE/IRE Computer Conference held in Philadelphia, several papers were given which discussed the performance of a single UNIVAC SYSTEM∗ during its first eight months of operation. Although only eight months have passed since that performance summary was given, a much greater effective length of time has passed because three more UNIVAC SYSTEMS have ...
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The following investigation on flip-flop circuits was originally undertaken to determine if a reliable flip-flop circuit could be designed to operate from a low supply voltage using tubes that are presently available and in production. The reason for designing the circuit to operate from a low supply voltage is to reduce the required power consumption of such information storage devices to a minim...
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A relay device is described which varies resistance in a stepwise continuous manner in order to approximate arbitrary functions of time. The device can be used with electronic differential analyzers to solve linear differential equations with variable coefficients. Sample solutions of Bessel's equation are included as examples. Calibration and measurement techniques which permit computer accuracie...
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An algebraic theory of the logical operation of digital computers is developed. This theory takes into account the dynamic (time) behavior of computer processes. The computer signals and computer elements are described. Their properties which are pertinent to the logical operation of digital computers are abstracted and. formulated in mathematical terms. The signals are represented by algebraic sy...
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A digital computer has been developed for use in airborne control systems. This application presents many problems. The computer must be small, light weight, and very reliable. It receives its input signals from instruments in the rest of the system. These signals are of the “analogue” continuous type and must be converted into the discrete electric signals used in the computer. The ...
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Through the use of an electronic differential analyzer arranged to give a sixth-order approximation of the Laplace shift operator, it is possible to reproduce an input signal and delay it T seconds when the highest angular frequency present in the input signal does not exceed 12/T. Inaccuracy due to nonlinear phase shift is less than 2% under these conditions. This device requires only linear comp...
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Reliable electronic circuit design must account for the parameter variations over the normal life of components to insure satisfactory operation. An analytical design method is derived for an Eccles-Jordan triode flip-flop in which the “worst” condition of voltage and component tolerances conditions are assumed that assures satisfactory operation for normal conditions. The method of ...
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Time-delay networks suitable for an analog computer are designed by considering the location of poles and zeros in their transfer functions. The curve of phase shift against frequency should be a straight line. The negative slope of this curve is the time delay. Even-order derivatives of the curve automatically vanish at zero frequency. Roots of the transfer function are chosen to make vanish simi...
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